丙烷氧化脱氢反应中Mg2V2O7催化剂氧活度的原位监测  

In Situ Monitoring of the Oxygen Activity on a Mg_2V_2O_7 Catalyst during the Oxidative Dehydrogenation of Propane

作　　者：计宝峰[1,2] 汪纪波[1,2] 楚文玲[1] 朱雪峰[1] 杨维慎[1] 林励吾[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023 [2]中国科学院研究生院,北京100049

出　　处：《催化学报》2009年第5期375-377,共3页

基　　金：国家杰出青年科学基金(20725313)

摘　　要：采用固体电解质电动势测量法原位监测Mg2V2O7催化剂的表面氧活度在丙烷氧化脱氢反应中的周期性振荡现象.直观地揭示了丙烷选择氧化反应中Mg2V2O7催化剂的先还原后氧化的过程.结果表明,丙烷选择氧化的控制步骤为丙烷在催化剂上的吸附和活化过程,且丙烷和氧气在催化剂上的吸附位不同,二者不存在竞争吸附.Periodic oscillations in the oxygen activity on a Mg2V2O7 catalyst during the oxidative dehydrogenation of propane were monitored in situ by solid electrolyte potentiometry. The results directly showed that the catalyst was first reduced and then oxidized. The rate- determining step was the adsorption and activation of propane on the Mg2V207 catalyst. Propane and oxygen were adsorbed on different sites of the Mg2V2O7 catalyst.

关 键 词：丙烷 丙烯 钒镁氧催化剂 氧活度 固体电解质电动势测量法 

分 类 号：O643.32[理学—物理化学]